Hugh: Make him have a word bubble where he says "Buzinga!"
Hmm...you could ask the artist to have a background that has shelves filled with specimens in jars and maybe some beakers full of colored liquids, because nothing says SCIENCE! like specimens in jars and beakers full of colored liquids.
If he's a field biologist, wearing some camo-esque coloring may be interesting, since it'd help him blend in with his surroundings and not scare (or attract) animals/bio-monsters. Maybe instead of his glasses, he could be wearing lab goggles (or have those on his forehead). And I'd give you a big hug if you had him patterned after a young Harold Ramis.